Fix PWA to open as standalone app instead of browser tab

## manifest.json
- Add `id` and `scope` fields for proper PWA identification
- Split icon purposes into separate entries (was "any maskable", now separate)
- Add `prefer_related_applications: false`

## index.html
- Add `viewport-fit=cover` for notched devices
- Add `mobile-web-app-capable` meta tag
- Add `application-name` and `msapplication` meta tags
- Add both 192px and 512px apple-touch-icon sizes

## styles.css
- Add safe-area-inset padding for notched devices (iPhone X+)
- Use 100dvh for proper mobile viewport height
- Add bottom safe area to toast container and macro grid

## service-worker.js
- Bump cache version to v2 to force update

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

web/manifest.json

@@ -1,8 +1,10 @@
 {
+    "id": "/",
     "name": "MacroPad Server",
     "short_name": "MacroPad",
     "description": "Remote macro control for your desktop",
     "start_url": "/",
+    "scope": "/",
     "display": "standalone",
     "background_color": "#2e2e2e",
     "theme_color": "#007acc",
@@ -12,14 +14,27 @@
             "src": "/static/icons/icon-192.png",
             "sizes": "192x192",
             "type": "image/png",
-            "purpose": "any maskable"
+            "purpose": "any"
+        },
+        {
+            "src": "/static/icons/icon-192.png",
+            "sizes": "192x192",
+            "type": "image/png",
+            "purpose": "maskable"
         },
         {
             "src": "/static/icons/icon-512.png",
             "sizes": "512x512",
             "type": "image/png",
-            "purpose": "any maskable"
+            "purpose": "any"
+        },
+        {
+            "src": "/static/icons/icon-512.png",
+            "sizes": "512x512",
+            "type": "image/png",
+            "purpose": "maskable"
         }
     ],
-    "categories": ["utilities", "productivity"]
+    "categories": ["utilities", "productivity"],
+    "prefer_related_applications": false
 }